OZ deal structures: permanent OZ, rural OZ, twinning.

OZ benefit mechanics — the three benefits

The Opportunity Zone regime was enacted as part of the Tax Cuts and Jobs Act (P.L. 115-97, December 2017) and codified at IRC §§ 1400Z-1 and 1400Z-2. The original regime designated 8,764 qualified opportunity zones in 2018 based on 2010 Census low-income community criteria. OBBBA (P.L. 119-21, July 4, 2025) makes the OZ regime permanent and provides for periodic redesignation of zones.

Benefit 1: Deferral

An investor with realized capital gains can defer recognition of those gains by reinvesting (the gain amount only, not basis) into a QOF within 180 days of the realization event. The deferred gain is recognized at the earlier of (a) the date the QOF interest is sold/exchanged or (b) the “inclusion date” defined by statute.

• Original 2017 statute: inclusion date was December 31, 2026 for all original-regime investments — meaning all 2017-era OZ investors recognized their deferred gain in tax year 2026 (which they paid in 2027).
• OBBBA permanent regime (2027+): rolling 5-year deferral — gains deferred under post-2026 designations are recognized 5 years after the QOF investment date (or earlier sale).

Benefit 2: Basis step-up

Investors holding QOF interests through certain milestones receive a partial step-up in their basis in the deferred gain:

• Original statute: 10% step-up after 5 years and an additional 5% (15% total) after 7 years — both achievable only if the QOF was funded before 2020 (5 years) or 2019 (7 years) given the 2026 inclusion date.
• OBBBA permanent regime: 10% step-up after 5 years for permanent regime investments, with enhanced 30% step-up for Rural OZ investments (see below).

Benefit 3: 10-year exclusion

This is the most valuable benefit. If the QOF interest is held for at least 10 years, the investor can elect to step up basis to fair market value at the time of sale, effectively excluding all post-investment appreciation from federal tax. The election is made on the investor’s tax return for the year of sale.

The 10-year exclusion has been the principal driver of OZ deal volume. It is preserved (with modifications) under OBBBA: investors in the permanent regime can still achieve full appreciation exclusion at 10 years, with the original deferral and step-up benefits adjusted to the new rolling schedule.

QOF/QOZB two-tier structure

OZ benefits flow through a two-tier structure governed by IRC § 1400Z-2 and Treas. Reg. § 1.1400Z2-2:

Tier 1: Qualified Opportunity Fund (QOF)

A QOF is an entity (partnership or corporation) self-certified to the IRS via Form 8996. To qualify:

• At least 90% of its assets must be qualified opportunity zone property (measured semi-annually on June 30 and December 31; failure triggers a penalty under § 1400Z-2(f))
• Qualified opportunity zone property is one of: QOZB stock, QOZB partnership interest, or qualified opportunity zone business property (QOZBP — the actual real estate)
• Investors invest capital gains (not basis) into the QOF within 180 days of the realization event

QOFs can be single-asset (focused on one property) or multi-asset (a fund-of-deals). Single-asset is much more common for real estate development deals because it gives the developer clear control and aligns investor expectations.

Tier 2: Qualified Opportunity Zone Business (QOZB)

A QOZB is the entity that actually operates the business or owns the real estate. To qualify under Treas. Reg. § 1.1400Z2-1:

• At least 70% of its tangible property must be qualified opportunity zone business property (in OZ, “original use” or “substantially improved”)
• At least 50% of gross income from active conduct of a trade or business in the OZ (with safe harbors)
• “Substantial portion” of intangible property used in the QOZ trade or business
• Less than 5% of unadjusted basis in nonqualified financial property (subject to working-capital safe harbor for development period)
• Cannot operate certain “sin businesses” (golf courses, country clubs, racetracks, casinos, massage parlors, hot tub facilities, suntan facilities, liquor stores, or any private or commercial golf course)

Why two tiers?

The two-tier structure exists because the QOF (Tier 1) needs to hold compliant property at 90% — harder during a development period when property is being constructed. By holding QOZB stock or partnership interest (which is itself QOZ property), the QOF satisfies the 90% test while the QOZB navigates the 70% tangible property test and the working-capital safe harbor for development cash held in reserve.

Substantial improvement test

For existing buildings or real property in an OZ to qualify as “qualified opportunity zone business property,” the QOZB must either (a) be the “original user” of the property (typically new construction or vacant rehab) or (b) substantially improve the property within 30 months of acquisition.

Under IRC § 1400Z-2(d)(2)(D)(ii), “substantial improvement” means doubling the adjusted basis of the property (excluding land) within 30 months. Practitioners typically calculate this as: post-improvement basis must equal at least 2× the unadjusted basis at acquisition. Land basis is excluded from both sides of the equation.

For acquisition-rehab affordable housing deals, the substantial improvement test usually drives deal sizing: total renovation budget needs to exceed the building’s share of acquisition cost to satisfy the test.

Rural OZ under OBBBA

OBBBA introduces a new category: the Rural Opportunity Zone. Permanent OZ designations made under OBBBA can be designated as rural based on Census Bureau rural designation. Rural OZ investments receive enhanced benefits:

• Enhanced basis step-up: 30% basis step-up after 5 years (vs 10% for non-rural permanent OZ)
• Reduced substantial improvement threshold: 50% basis increase required (vs 100% for non-rural) for existing-property OZ investments
• State coordination: rural OZ designations align with USDA Rural Housing eligibility criteria (Section 515/538 programs), creating natural stacking opportunities

Practitioners working in rural counties should evaluate whether a project site qualifies for Rural OZ under the permanent regime. The reduced substantial improvement threshold can make acquisition-rehab projects viable that would not work under the standard 100% test.

OZ + LIHTC stacking

OZ + 4% LIHTC + tax-exempt bonds

The OZ + 4% LIHTC structure has become the predominant OZ-affordable housing stack post-2018. Key mechanics:

• QOZB owns the LIHTC project and elects 4% LIHTC at placed-in-service
• Tax-exempt bond debt (sized to meet the 4% § 42(h)(4) financed-by test — 25% post-OBBBA for bonds after Dec 31, 2025) provides the bond layer
• QOF investors contribute capital gains as QOF equity (typically 30–50% of total project cost)
• The 4% LIHTC equity is purchased by a separate LIHTC investor (the “syndicator”) at standard pricing
• Net: investors get OZ deferral + 10-year exclusion + 4% LIHTC equity benefit

The structure is complex but works mechanically because the QOF/QOZB and LIHTC partnership structures can coexist. Typical structuring uses the QOZB as the LIHTC partnership’s general partner or sole member, with the QOF as the upper-tier owner.

OZ + 9% LIHTC

The OZ + 9% combination is less common because 9% LIHTC is competitive and projects in 9% allocation often do not generate enough cash to support meaningful debt or high-priced equity in addition to LIHTC syndication. Where used, the structure follows the 4% pattern but without the bond debt layer.

OZ + HTC stacking

OZ pairs naturally with the federal Section 47 Historic Tax Credit (HTC). HTC requires substantial rehabilitation of a certified historic structure within a 24-month measurement period (with phasing options). The OZ substantial improvement test (double basis within 30 months) is compatible with HTC’s substantial rehabilitation test (basis improvement equal to greater of $5,000 or adjusted basis within 24 months) — both can be satisfied with the same renovation work.

The HTC equity is purchased by a separate HTC investor (often the same investor on an integrated basis); the OZ benefits accrue to the QOF investors. Both credit structures must navigate complex partnership accounting and disguised-sale rules (Notice 2018-99 and subsequent guidance for HTC; the OZ regulations for QOF compliance).

OZ + NMTC stacking

The federal New Markets Tax Credit (NMTC) under IRC § 45D can be stacked with OZ where the project is in both a qualified census tract (NMTC) and a designated opportunity zone (OZ). The overlap is roughly 65–70% of OZs — most OZs were carved from existing low-income census tracts.

The NMTC structure (Community Development Entity — CDE — making a qualified low-income community investment in a qualified active low-income community business) layers above or alongside the QOZB. Coordination is complex; both structures impose partnership-level rules, exit restrictions, and ongoing compliance.

NMTC has a 7-year compliance period (with credits claimed in years 1–7 totaling 39% of the investment). The OZ 10-year hold is longer than the NMTC compliance, so OZ + NMTC structures must plan for unwinding the NMTC structure (typically by “put” of the CDE’s interest to the NMTC investor at year 7) while continuing the OZ structure through the full 10-year hold.

10-year hold and exit

The OZ 10-year hold mark is the structural goal. At year 10 (measured from the QOF investment date), the investor can elect to step up basis to fair market value at the time of QOF interest disposition. This effectively eliminates federal tax on post-investment appreciation.

Exit mechanics vary by structure:

• QOF interest sale: the investor sells the QOF interest to a third party at year 10+. The QOF’s underlying property is then a question for the buyer; the seller’s benefit is locked in at the QOF level.
• QOF liquidation: the QOF distributes property to investors who then sell. More complex; certain elections required.
• Property-level sale: the QOZB sells the underlying property; gain flows up through the QOZB to the QOF to the investors, and the basis step-up to FMV applies to the investors’ QOF interest. This is the most common exit mechanism for real estate deals.
• Refinance instead of sale: for LIHTC-stacked deals where the project must remain affordable through Year 30 (extended use), a Year 10 cash-out refinance (rather than sale) can return capital to OZ investors. The investors’ QOF interest is still held; the appreciation exclusion benefit is locked in at the eventual sale.

State conformity

The OZ benefits are federal income tax benefits. State income tax conformity varies:

• Most states automatically conform to federal capital gains rules and OZ deferral/exclusion (the “rolling conformity” states)
• A handful of states (California, Massachusetts, Mississippi, New York, North Carolina, Pennsylvania) decoupled or partially decoupled from OZ at the state income tax level, meaning OZ deferral and exclusion do not extend to state income tax
• Practitioners should confirm state conformity when sizing investor return expectations; the difference between federal-only and federal+state benefit can be material (often 20–30% of total tax savings)

Putting it together

OZ structures reward complexity. The basic benefits — deferral, step-up, 10-year exclusion — are clear, but the execution requires careful navigation of the QOF/QOZB two-tier framework, the substantial improvement and working-capital safe-harbor tests, the multi-stack coordination with LIHTC/HTC/NMTC where applicable, and the long-term exit mechanics.

Post-OBBBA, the permanent OZ regime and the Rural OZ category open new structural opportunities. The 25% bond-financed-by test (OBBBA’s LIHTC provision) is particularly synergistic with OZ + 4% LIHTC stacks: less bond debt required for the LIHTC qualification means more QOF equity can be efficiently deployed in the capital stack. Practitioners working in OZ-designated tracts should re-evaluate their pipeline against the post-OBBBA structural opportunities.

Sources & further reading

• OZ Program Guide — full federal program treatment on this site
• P.L. 119-21 (One Big Beautiful Bill Act), enacted July 4, 2025; permanent OZ provisions effective 2027
• P.L. 115-97 (Tax Cuts and Jobs Act, December 2017) — original OZ statute
• IRC §§ 1400Z-1 and 1400Z-2 (OZ designation and tax benefits)
• Treas. Reg. §§ 1.1400Z2-0 through 1.1400Z2-5 (OZ regulations, final 2019)
• IRS Form 8996 (QOF self-certification) and instructions
• IRS Form 8997 (QOF investor reporting)
• 4% vs 9% LIHTC and bond compliance — companion article on the LIHTC side of OZ + LIHTC deals
• Every LIHTC deal structure, explained
• Sources & Attribution — full source catalog